Surface charge-transfer doping for highly efficient perovskite solar cells

Liu, Xianjie (author): Linköpings universitet,Laboratoriet för organisk elektronik,Tekniska fakulteten

Fahlman, Mats (author): Linköpings universitet,Laboratoriet för organisk elektronik,Tekniska fakulteten

Bao, Qinye (author): East China Normal Univ, Peoples R China; Shanxi Univ, Peoples R China

(creator_code:org_t)

Related links:: https://urn.kb.se/re...; show more...; https://doi.org/10.1...; show less...

Abstract Subject headings

Nonradiative recombination losses are the predominant reason that limits the full thermodynamic potential of perovskite solar cells (PSCs), mainly originating from surface defects and interfacial energetics. However, their synergies between the two key factors are poorly understood. Herein, we systemically explore the energetic role of ionic liquid defect-passivator Tetrabutylammonium hexafluorophosphate (TBAPF(6)) on n-i-p planar PSCs. The perovskite film surface has been transformed from p-type to n-type after TBAPF(6) modification, evidenced by a shift of Fermi level closer to the conduction band. The n-type energetics result in a higher density of electron carrier and a smaller electron extraction barrier at perovskite/PCBM interface, promoting charge transport. It is also shown that the perovskite film can undergo a clear transformation from n-type to p-type character as increasing work function of substrates. Further studies clearly illustrate that TBAPF(6) not only reduces the surface defect-assisted recombination, but also restrains the interface carrier recombination. These combined effects lead to the effective suppression of nonradiative recombination, attributing to a significant improvement in the device power conversion efficiency.

By the author/editor: Xiong, Shaobing; Dai, Ying; Yang, Jianming; Xiao, Wei; Li, Danqin; Liu, Xianjie; show more...; Ding, Liming; Gao, Pingping; Fahlman, Mats; Bao, Qinye; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

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